VIDEO from a police dash cam has been released of the dramatic moment a distraught kidnap victim is rescued from a car in Dallas.

Just minutes earlier, the woman had alerted two teens to her situation by mouthing the words 'help me', after allegedly being snatched at gunpoint in the Texan capital.

The quick-thinking teens called the police after they realised the woman was in serious trouble and moments later officers were trailing the vehicle.

As police pulled over the car and asked the driver to step out, the woman, held in the back seat, can be overheard sobbing on an officer's microphone.

The emotional woman is rescued from a suspected kidnapper.Source:Supplied

The 25-year-old woman claims she was kidnapped at gunpoint on August 22, after leaving an office building in downtown Dallas.

As the car she was travelling in stopped at a traffic light, she took the opportunity to alert two students in a nearby car.

The teens, 19-year-old Aaron Arias, and his friend 17-year-old Jamal Harris, said they were checking out a girl in the back seat because "she's kind of attractive" when suddenly the guy driving looked around at them.

Realising the passenger was in a panicked state and whispering words, they called the cops and followed the car until the police caught up with them.

The lucky woman was rescued unharmed.

The driver, Charles Atkins Lewis Junior, has been charged with aggravated kidnapping and is in jail on $US50,000 bond.